Abstract
Bibersteinia trehalosi and Mannheimia haemolytica, originally classified as Pasteurella haemolytica biotype T and biotype A, respectively, under Genus Pasteurella has now been placed under two different Genera, Bibersteinia and Mannheimia, based on DNA-DNA hybridization and 16S RNA studies. While M. haemolytica has been the predominant pathogen of pneumonia in ruminants, B. trehalosi is emerging as an important pathogen of ruminant pneumonia. Leukotoxin is the critical virulence factor of these two pathogens. While the leukotoxin of M. haemolytica has been well studied, the characterization of B. trehalosi leukotoxin has lagged behind. As the first step towards addressing this problem, we developed monoclonal antibodies (mAbs) against B. trehalosi leukotoxin and used them to characterize the leukotoxin epitopes. Two mAbs that recognized sequential epitopes on the leukotoxin were developed. One of them, AM113, neutralized B. trehalosi leukotoxin while the other, AM321, did not. The mAb AM113 revealed the existence of a neutralizing epitope on B. trehalosi leukotoxin that is not present on M. haemolytica leukotoxin. A previously developed mAb, MM601, revealed the presence of a neutralizing epitope on M. haemolytica leukotoxin tha...Continue Reading
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